化工原理chapter9.4.ppt

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化工原理chapter9.4

number of transfer units NTU let 2. For liquid base, Z = HOLNOL calculation of NTU (NOG) for curved equilibrium line For curved equilibrium line or the relationship can not be expressed as a simple math function. B. numerical integration It is equivalent to the graphical method in mathematics. steps to solve 1 For a integration zone (Y1,Y2) as shown in Figure 9.16b, it can be divided into n equal sections. 2 Select a suitable numerical format to integrate. e. g., a simple echelon equation can be used. The Eq. has an accuracy of n+1 order and the accuracy depends on the value of n. 3 check mass transfer coefficient 1 measurement by experiment 2 Empirical equations e.g. absorb CO2 by water It is a liquid phase dominated process 3 Dimensional analysis * Chapter 9 Gas Absorption Calculaiton of packing height 1.For gas base let number of transfer units=NTU dY —— gas concentration change passing a height of dZ Y-Y* = ΔY —— driving force of mass transfer ∴ NOG represents the hardness of the absorption task ∴ NOG is a function of the equilibrium relationship, gas concentration and liquid/gas ratio. as the height of one overall gas transfer unit HOG = Z / NOG , the packing height for one transfer unit. A small HOG means a short unit height or a short tower. For a given task, it means a high efficiency equipment. It is related with a of packings, the flow condition in tower, V, and KY. NOG represents the hardness of the task, a large NOG means a hard task. HOG gives the equipment efficiency,a large HOG means a low efficiency. Calculaiton of packing height height of a transfer uni

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